3J45

Structure of a non-translocating SecY protein channel with the 70S ribosome


ELECTRON MICROSCOPY
Sample
non-translating E coli ribosome-SECYEG channel complex
Sample Components
non-translating 70S ribosome
SecYEbetaG
Specimen Preparation
Sample Aggregation StatePARTICLE
Vitrification InstrumentHOMEMADE PLUNGER
Cryogen NameETHANE
Sample Vitrification DetailsBlot 1 second before plunging into liquid ethane (HOMEMADE PLUNGER).
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles39000
Reported Resolution (Å)9.5
Resolution MethodOTHER
Other DetailsCTF correction was done on untilted and 30 degree tilted images. Resolution method was comparison of 3D map with calculated map of docked ribosomal co ...CTF correction was done on untilted and 30 degree tilted images. Resolution method was comparison of 3D map with calculated map of docked ribosomal components, with the second map made with EMAN at 7 Angstrom resolution.
Refinement Type
Symmetry TypePOINT
Point SymmetryC1
Map-Model Fitting and Refinement
Id1 (2I2P)2 (3J01)
Refinement SpaceREALREAL
Refinement ProtocolFLEXIBLE FITFLEXIBLE FIT
Refinement Target
Overall B Value
Fitting Procedure
DetailsREFINEMENT PROTOCOL--FLEXIBLEREFINEMENT PROTOCOL--FLEXIBLE
Data Acquisition
Detector TypeKODAK SO-163 FILM
Electron Dose (electrons/Å**2)20
Imaging Experiment1
Date of Experiment2006-04-10
Temperature (Kelvin)93
Microscope ModelFEI TECNAI F20
Minimum Defocus (nm)1000
Maximum Defocus (nm)2500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)30
Nominal CS2
Imaging ModeBRIGHT FIELD
Specimen Holder ModelGATAN LIQUID NITROGEN
Nominal Magnification50000
Calibrated Magnification51000
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)200
Imaging Detailslow dose imaging with manual data collection
EM Software
TaskSoftware PackageVersion
MODEL FITTINGMDFF
MODEL FITTINGUCSF Chimera
RECONSTRUCTIONEMAN1
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
per micrograph